© 2000-2013 New York Independent System Operator, Inc.  All Rights Reserved.

NYISO Phasor Measurement

Unit Capability Wes Yeomans

Vice President OperationsNew York State Public Service Commission

Power Quality Technical ConferenceDecember 12, 2013

© 2000-2013 New York Independent System Operator, Inc.  All Rights Reserved.

Phasor Measurement Units• Monitoring devices called phasor

measurement units (PMUs) measure the instantaneous voltage and current phasors, and frequency at specific locations in the electricity transmission system Voltage and current phasors are parameters

characterizing the transfer of electric power from generation plants to end-user loads

Frequency is the key indicator of the balance between electric load and generation

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Smart Grid Project• Budget: $75,710,733• Timeline: July 1, 2010 – June 30, 2013• Partners: NYISO and New York

Transmission Owners• Equipment: Phasor Measurement

Units, Phasor Data Concentrators, Phasor Measurement Network, Capacitors

• Applications: Enhanced State Estimator, Voltage Stability Monitoring, Situational Awareness (Visualization), Post Analysis

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Synchrophasor Applications

• Phasor Enhanced State Estimator• Phasor Enhanced Voltage Stability

Monitor• Post-Event Analysis• Visualization / Situational Awareness

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Phasor Enhanced State Estimator

• NYISO State Estimator was augmented to accept SynchroPhasor measurements Voltage magnitudes & angles (220+) Current magnitudes & angles (280+) Frequencies (70+) Line flow Mw & Mvar (400+)

• Selected points are being used by SE• Monitor the actual values against SE

solutions• Phasor Enhanced State Estimator developed

by ABB

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Voltage Stability Monitor• For a given interface VSM provides

Proximity of voltage collapse under real time conditions Proximity of voltage collapse under contingencies

• VSM Program Execution Every 30 seconds after State Estimator run with SE data Every 2 seconds with updated PMU data

• Contingency Selection Process pre-defined set of contingency definitions

every 30 seconds• Initial focus is on NYCA Central-East Interface

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Post-Event Analysis• NYISO uses the Phasor Grid Dynamics

Analyzer (PGDA) for off-line analysis of system events (e.g. BPS line tripping, generation trip of 300 MW, etc.) Frequency response Transient voltage recovery Modal analysis (freq. oscillations) Ringdown analysis (dampening) System Stress analysis Validation of system component

response (SVCs, Statcom)

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Replay of System EventsOperators able to replay events and zoom in on any points of interest

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Visualization & Situational Awareness

• PMUs grouped by zones to reflect expected coherent generation response

• Visualization is part of new NYISO Control Center video wall

• Displays / dashboards organized by New York’s electrical load zones, as well as by external neighboring electrical regions

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Video Wall Dashboard• New Alarming Capability for New York State

Abnormal oscillation detection Abnormal voltage magnitude & angle Abnormal frequency

• New Alarming Capability for External Regions Abnormal angle differences across external regions Abnormal voltage magnitude Abnormal frequency

• Short Term View (minutes) and Long Term View (hours) for Wide Area Monitoring (WAM) of angle differences of External Regions

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Wide Area Monitoring

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Video Wall Dashboard

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Scheduled & Forced Outages

• The NYISO coordinates bulk power generator and transmission scheduled outages with Generator Owners and Transmission Owners to meet steady-state “pre” and “post” operating criteria.

• The NYISO directs operating actions to “re-secure” power flows post contingency

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© 2000-2013 New York Independent System Operator, Inc.  All Rights Reserved.

The New York Independent System Operator (NYISO) is a not-for-profit corporation

responsible for operating the state’s bulk electricity grid, administering New York’s competitive wholesale electricity markets,

conducting comprehensive long-term planning for the state’s electric power system, and

advancing the technological infrastructure of the electric system serving the Empire State.

www.nyiso.com

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